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javaSE-0113/javaSE-day09/src/com/inmind/properties06/PropertiesDemo18.java

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package com.inmind.properties06;
import java.util.Properties;
import java.util.Set;
/*
Properties 的特点与基本使用(重点)
构造方法
public Properties() :创建一个空的属性列表。
常用的存储方法
public Object setProperty(String key, String value) 保存一对属性。
public String getProperty(String key) :使用此属性列表中指定的键搜索属性值。
public Set<String> stringPropertyNames() :所有键的名称的集合。
注意:
1.Properties类似一个HashMap
2.它的真正作用是,能够将指定的配置文件的信息读取到properties对象中
*/
public class PropertiesDemo18 {
public static void main(String[] args) {
//创建属性集对象
Properties properties = new Properties();
//保存属性键值对
/*properties.put("username", "admin");
properties.put("password", "123");*/
properties.setProperty("username", "admin");
properties.setProperty("password", "123");
Set<String> keys = properties.stringPropertyNames();
System.out.println(keys);
System.out.println(properties);
}
}